Onkyo TX-SR703 and Lsi9

bullseye

I am considering to buy a lsi speaker set for my ht.
Can a tx-sr703 safely handle the 4ohm load of the lsi's

thanks for your attention!!!!!

Dennis Gardner

At low volumes, yes. At theater level, no.

bullseye

could somebody explain me????

cfrizz

Theater level I believe is 75 decibels, which requires alot of power from the amp portion of your receiver which isn't strong enough to do it. This will throw the reciever into protect mode to keep from burning up your receiver.

bullseye

for a newbie like me, in plain english what does it mean!!!!

thanks for your patience with me!!!! :cool:

mldennison

that amplifier is probably not powerful enough to power those speakers at high volumes. at low volumes it will work. if you want to listen at loud volumes, get something more powerful.

cfrizz

The receiver you are considering, does have pre-outs in the back to add separate amplification to run your speakers. (this is a good thing)

So you can get a 1-7 channel amplifier/s to run your power hungry LSI 9 speakers.

Do a search here on the forum for receivers & LSI's to get more info.

aaharvel

Power Supply x Current x 4 OHM Stable x Weight = Happiness.

In the audio world, obese is best.

dave shepard

If you are looking to get a reciever that will run 4ohms I would look at NAD they are rated for 4ohms and have the dynamic power into 2ohm's. They are a good choice and have a good clean sound with good dynamics. Otherwise you would be better served with seperates.

Dave

McLoki

Dennis Gardner wrote:

At low volumes, yes. At theater level, no.

I think what he ment was at reference level.

With your reciever as you turn up the sound if the volume number gets smaller it is relative mode. (relative to dolby reference level) If when you turn up the volume the number goes up as it gets louder it is in absolute mode. (means something to you, but no one else)

My Onkyo AVR lets me choose back and forth between the two modes. Yours may as well. If you calibrate your system (using a radio shack SPL meter) the test tones in your AVR should be about 75 db. (the best way to calibrate is with a test dvd disk like avaya or Video essentials, but we will skip that for now)

Reference level is when your volume control reaches 0. 105db peaks from all speakers except your sub - it gets 115db (with all speakers set to small)

If you listen to a movie at -20 it is considered 20db below reference level or the loudest parts of a movie are about 85db with 95db from your subwoofer.

For reference - when the family is home we listen to most movies around -25 to -30. When it is just me and the wife we listen at -15 to -25. When I demo my system I usually demo it at -10 to -5 (it is really loud )

I would say you could listen at -20 with no problems. Down around -15 you might start pushing your luck on things.

Does that explain it any better?

Michael

McLoki

aaharvel wrote:

In the audio world, obese is best.

And I am a happy man. (I knew I liked this hobby for a reason.... )

Michael

John K.

Bullseye, welcome. The LSi9s are excellent speakers with about average sensitivity, which means that they'd be using about 1 watt to produce a comfortably loud average level(about 85dB)at your listening position. Now, if briefly a peak at the level of 105dB which was mentioned occurred, this would take 100 times as much power, i.e. 100 watts.

There don't appear to be any test reports on the 703 yet, but the next model down, the 603, tested at 155 watts into 4 ohms. Unless your room is unusually large and you play at unusually high volume the 703 should be fine with your LSi9s.

F1nut

No one, anywhere is rating the TX-SR703 at any less than 8 ohms. Take that info for what it's worth.

dave shepard

The last I knew the Onkyo's were rated 8-6ohms's stereo (2-channels running) as are Denon and many others. You would have to coincider what you would be listining to and start there, I mostly use mine for movies but do/have used it for 2ch-stereo and sometimes feel like jamming and put it on 5-7channel stereo when I have done that it went into protection mode and shut down from running hot (like it is supose to) so I had to get a 7-ch amp to allow me to do all I wanted without worring about driving the Denon too hard. If I were running the LSi's it would have shut itself down much sooner because the LSi's demand more power.

Dave

Holydoc

The Onkyo's have a "mystery" rating that they call Dynamic Power Ratings. For instance, my stereo has Power Rating of:

110watt @ 8 Ohm - assuming that is single channel
150watt @ 6 Ohm - assuming single channel again

Now they also publish the "mysterious" Dynamic Power rating. For my stereo it is:

140watt @ 8 Ohm - Pushing 2 front speakers
220watt @ 4 Ohm - Pushing 2 front Speakers
280watt @ 3 Ohm - Pushing 2 front Speakers

The only definition that Onkyo gives for this Dynamic power is that it is calculated on basis of IHF Dynamic headroom. ???

Oh well... my point is that this may be the ratings that are being used in this thread.

F1nut

That means they are not rated to drive a 4 ohm load on a regular basis.

bullseye

Thanks for all your explanations now I understand a lot better. Looks that for now the lsi are not the ones for me.

Thanks again!!!!!!!

marlap

I have the same receiver (just love it by the way). There is a setting to select either 4ohm impedance or 6 to 16 ohm impedance speakers. Page 46 of their manual. Hope this helps.

I know this, because one of the many reasons I chose this receiver, was that it could handle my 4ohm Magnepan speakers.

ben62670

Any big store receivers will not handle 4 ohm loads very well. The 4 ohms setting is just current limiting which reduces power. Very few companies will publish all channels driven at 4ohms. HK is the most honest of main stream receivers. 50 watts HK is better than most 110+ watt big store brands.